Automatic traction-hoist



c. P. ROSS.

AUTOMATIC TRACTION HOIST.

APPLICATION FILED JULY 24. 1919.

1,352,632. Patented Sept. 14,1920." F2, 2 2 SHEETS-SHEET x. B2 j v C2.HH HIIIHHI I rm Inveniar.

C. P. ROSS.

AUTOMATIC TRACTION HOIST.

APPLICATION FILED JULY 24, 1919.

te p 14, 1920.

. I F 2 SHEETSSHEET 2- 12.4; g

Wrze fi, I (:Z 653' j. 220,55.

PAT NT, If

:CL'YDE 1?. Ross, on nmrwo n, rumors, Ass lenon wo mnnm assuringCOMPANY, ECHIC AGO,EELLINOISpA' oonrona'rronorj, ILLINOIS. j

AUTOMATIC"TRACTION-H0151:

Be it known that I, CLYDE P. Boss, acitizen of United States, residingat Kenilworth, in the county -of,Cook and State of Illinois, haveinvented a certain new iand useful Improvement in AutomatioElectricTraction-Hoists, of which the followingris a specification.

My invention relates to an improvement in automatic traction, coalhoists and has for a general object the prevention of overwindv ingofsuch hoists when the carriage reaches its limit. This object I obtainbytheapplication to a coal handling plant, of a drum operating onthetraction principle, passing the hoisting cable under the hoistingdrum,

, and maintaining this tractionon the-drum I hoist.

by means of a counterweight or second carriage attached to the end ofthe cable; 1 When the counterweight grounds, the-cable slacks thetraction is reduced, the; cable slides on the hoistin drum and the;carriage ceases to, move. 1 other object is the provision of a removabletire for the'hoising drum, which may be easily removed when worn outwithout removing the cable ordismantling the Other objects .will appearfrom time to time in the specification. f Y

I illustrate my. invention diagrammatis cally in the following drawingswherein: Figure 1 is a side elevation of my hoist gi Fig. 2 is a planviewof my hoist 1 1. Fig. 3 is a detail-of the hoisting, drum on anenlarged scale; o a i Fig. 4: is a section on lines 4.-4 of Fig. 3;Likeparts arerepresented by like charactersin all the figures. r ,A isan integral base plate on whichj-the hoisting machine is mounted. Itcarries Se.- cured to it the connected supporting frames A A andadjacent them, se'curedto the base, the motor B. The motor drives, the

motor shaft BPwhichcarries keyed to it? the pinion 13. Mountedontheframe A .is the shaft C supported in the, bearings C C It has keyed toit the gear C in mefsh with the pinion B Intermediate the ends of theshaft, is keyed the pinion O Mounted on the frame A is a shaft Dwhich-rotates in the bearings D D Keyed to'it is the gear D in mesh withthe pinion C Keyed to the same shaft is the hoistingdrurn ET. ThisSpecification of letters l 'atent. LP-

I tentedfseptyia,1920. 1919. Serla1No, 3 12,97 9

drum-is provided with a removable tire preferably although notnecessarily, constructed in two sections E E The periphcry of the,tireis surrounded by al plurality of deepzv-shaped grooves E Theremovabletire sections adjacent their 'meeting point: one withnanotherhave laterally and inwardly extending lugs E, engaging, each pairbetweenithem, the lugs E onthe web of the hoisting drumf These l ugs'are all perforatedto receive a bolt E which: passes through eachrpair oflugs on the" removable l rim-and the lug 0n the. drum \veb which :liesbetween them.' The bolts and'nutsiE when locked in place firmly lioldtheassemwbly ,to ether. The .lugsE .being offset to ward t evcenterofrotationof=the"drum,are adapted to prevent displacement of the tiresections on the drum. The cable F, one end ofwhich is attached to thehoistingv carriage andqthe other to the counterweight orto a secondcarriage, passes over pulleys-not shown, and is looped around the lhoisting drumengagin -it abo'utthe lower halfof its periphery.y-hoisting drum'isto used with an; automatic controller which determinesthe lengthof excu'rsionof theeable;

.Itwill, of course, be understood that this showing'is largelydiagrammatic and that while an operative" device has been illustratedyrnany variations in shape, disposition of parts and'in setting upof the systemfcould be made Without departing from the-spirit of j-myinvention, and for :this reason I wish my drawings to be taken aslargely diagrama The use and operationof my invention are as followsMyihoisting drum is driven in any suitable way fromdrivingmeansxadjacent there'- to. It is the usual practice inhoistingdrums forheavy work such as in coaling plants for raising, lowering, orstoring coal, to wind the cableabout the drum and secure one end ofittothe drum. 1 There 'ar'efmany "disadvantages to this method includingthe risk of overwinding, if'thetiming and limiting device, :automatic orotherwise, fail to funcmethod, regardless of any control, automatic ormanual, of the hoisting means, by applying to a heavy coal hoist thetraction systerm. The hoisting cable is carried about the hoisting drumand engages it on only half of its periphery. Obviously, the hoistingdrum may be placed at the top or at the bottom of the hoistingexcursion, or anywhere else, depending on the arrangement of a cable andthe needs of the particular installation. In any case, the cable willnormally engage the hoisting drum about half or less of its periphery,and in the figures herein shown, the form wherein the cable engages thedrum about the lower half of its periphery is illustrated.

When the hoisting carriage and the counterweight or second carriage areboth hanging free, the tension on the cable is sufficient to compress itwithin the V-shaped slot and hold it against the drum with 'sufiicientpower to prevent its moving with relation to the periphery of the drum.When the drum is revolved the cable moves with it. When thecounterweight or the carriage grounds, however, the tension on the cableis reduced and the whole cable is slacked. This so reduces the tensionbetween the cable and the drum that the cable slides with relation tothe drum and the drum is no longer able to hoist. Thus, no matterwhether or not the rotation of the drum continues, the traction hasceased and the carriage remains stationary. Any possibility ofoverwinding is thus absolutely prevented. It is hardly necessary toemphasize the importance of such a provision for a coaling hoist wherethe weights handled are great and the damage which can be done byoverwinding is enormous. To remove the rim of the drum of this hoist,all that is necessary is to rotate the drum to allow one of the segmentsto occupy that upper part of its periphery which is not engaged by thecable, then the operator removes the holding bolts and lifts the uppersegment off and replacesit with a new one. Then the drum is rotated andthe same process repeated with the other segment or segments. Thisprevents the necessity of unshipping the cable a complicated, long andexpensive operation. It prevents the necessity of any dismounting of themachinery, and permits the whole operation to be performed with simlicity and despatch. When the drum surihce wears out, the tire can thusbe quickly and easily replaced by an unworn set of segments.

It will be understood that in a device such as this under constant heavyduty the need of easily removable segments is great because theyfrequently wear out when as here the traction system is used and in factit would probably be commercially impossible to use the traction typevof hoist without some such provision for readily renewing the drum face.

I claim 1. In a hoisting drum, a radially thin removable hoisting drumrim comprising a plurality of engaging rim sections and means forseparately removing them.

2. In a hoisting drum, a radially thin removable drum rim-comprising aplurality of radially thin removable rim sections, said sections adaptedto be removably secured to cent their engagement with each other orsecuring them at the same time to each other and to the drum, comprisinglugs on the opposed ends of the tire segments in line with each otherand lugs on the drum rim in line with and between said tire lugs,together with securing means for securing together each such set oflugs.

5. In a hoisting drum adaptedfor use with a hoisting cable, a removablerim and means for removing and replacing it without dismounting thecable from the drum.

6. In a hoisting drum adapted for use with a hoisting cable engaging thedrum only about part of its periphery, a removable rim comprising aplurality of removable segments, each'of said segments adapted to beremoved and replaced in turn during the engagement by the belt of theother segments.

In a hoisting drum, adapted for use with a hoisting cable engaging thedrum substantially about the lower half of its periphery, a removablerim adapted to be removed without the dismounting of the cable from thedrum, said rim comprising a plurality of removable segments each in turnadapted tobe removedand replaced while lying on the upper periphery ofthe drum, the other segments being supported in place on the drum by thetension of the hoisting cable.

8. In a hoist adapted for the handling of heavy weights, a hoisting drumand means for driving it, a hoisting cable frictionally driven therebyand a radially thin removable drum rim comprising a plurality ofremovable rim sections.

9. In a hoist adapted for the handling of A In testimony whereof, Iafiix my signature heavy weights, a hoisting drum and means in theFresence of two witnesses this 21st 1 for driving it, a cablefrictionally driven day of uly 1919. thereby and a removable drum rimadapted CLYDE P. ROSS.

5 to be removed from the drum and replaced Witnesses:

without interrupting the frictional engage- AGNES G. JOHNSON,

ment of the cable with the drum. EDITH L. PORTER.

